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I think I would try the test mode, and use a calculator and stopwatch to verify that the miles advance at the same rate of speed you set the test mode at.

Basically when you put it into test mode it sends out a 1mph signal to the speedo. Each subsequent push of the test button doubles the speed 1-2-4-8-16-32-64-128-256.

Note that the mileage should advance at the same rate of the TEST signal, not the indicated speed. Any difference between the signal and indicated speed is due to speedometer error.

If the odometer is accurate, I would then have to ask you a second question:

Does your son have a friend named Ferris Bueller? :woot:
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